Java创建Accont类，模拟的ATM机

介绍

Account类，模拟一台ATM机。创建一个有10个账户的数组，其id为0,1，…,9，并初始化收支为100元人民币，系统提示用户输入一个id，如果输入的id不正确，提示用户输入正确的id，一旦接受一个id，就显示下图所示的主菜单，可以选择1来查看当前的收支，选择2表示取钱，选择3表示存钱，选择4表示查看操作信息 (每笔交易都是一个Transaction类的实例,新数据域transactions，它的类型是ArrayList，可以为账户存储交易，每笔交易都是一个Transaction类的实例)选择5退出。退出主菜单。

运行效果

1.Account类

package src;
import java.util.ArrayList;
import java.util.Date;

public class Account {
    private int id = 0;
    private String name;
    private double balance = 0.0;
    private double annualInterestRate = 0.0;
    private Date dateCreate;
	private ArrayList<Transation> transation;

//构造方法
    public Account(){
        this.dateCreate = new Date();
        this.transation = new ArrayList<Transation>();
    };
    public Account(int id,double balance){
        this.id = id;
        this.balance = balance;
        this.transation = new ArrayList<Transation>();
    }

    public Account(int id,double balance,String name){
        this.dateCreate = new Date();
        this.id = id;
        this.balance = balance;
        this.name = name;
        this.transation = new ArrayList<Transation>();
    }

//访问器和修改器

    public void setId(int id){
        this.id = id;
    }

    public int getId(){
        return id;
    }

    public void setBalance(double balance){
        this.balance = balance;
    }

    public double getBalance(){
        return balance;
    }

    public void setAnnualInterestRate(double annualInterestRate){
        this.annualInterestRate = annualInterestRate;
    }
    
    public double getAnnualInterestRate(){
        return annualInterestRate;
    }

    public Date getDateCreated(){
        return dateCreate;
    }
    public void setName(String name){
		this.name = name;
	}
	public String getName()
	{
		return name;
	}
	
	public ArrayList<Transation> getTransation()
	{
		return transation;
	}
	
//月利息

    public double getMonthInterestRate(){
        return this.balance * this.annualInterestRate/12;
    }

//取款

    public void withDraw(double money){
        this.balance -= money; 
        Transation tempT = new Transation('W', money, this.getBalance(), " 取钱 ");
		transation.add(tempT);
    }

//存款

    public void deposite(double money){
        this.balance += money;
		Transation tempT = new Transation('D', money, this.getBalance(), " 存钱 ");
		transation.add(tempT);
    }
}

2.Transation类

package src;

import java.util.Date;
 
public class Transation
{
	
	private Date date;
	private char type;
	private double amount;
	private double balance;
	private String description;
	
	public Transation()
	{
		date = new Date();
		description = new String();
	}
	
	public Transation(char type, double amount, double balance, String description)
	{
		this.date = new Date();
		this.type = type;
		this.amount = amount;
		this.balance =  balance;
		this.description = description;
	}
	
	public String toString()
	{
		return "交易类型" + type + " : " + description + amount + " balance " + balance + " 交易时间 " + date.toString();
	}
}

2.Test类(主函数在Test）

package src;

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Account[] account = new Account[10];  //新建10个账户
        for(int i = 0; i < 10; i ++ ){          
            account[i] = new Account(i,100);
        }
        System.out.print("Enter an id: ");
        int id = sc.nextInt();
        while(true){
            if(id >=0 && id < 10) break;
            else{
                System.out.print("Id error\nEnter an id: ");
                id = sc.nextInt();
            }
        }
        while(true){
            System.out.println("Main menu");
            System.out.println("1: check balance");
            System.out.println("2: withdraw");
            System.out.println("3: deposit");
            System.out.println("4: Transation");
            System.out.println("5: exit");
            System.out.print("Enter a choice: ");
            int choice = sc.nextInt();
            if(choice == 5) break;
            switch(choice){
                case 1:{
                    System.out.println("The balance is " + account[id].getBalance());
                }break;
                
                case 2:{
                    System.out.print("Enter an amount to withdraw: ");
                    double money = sc.nextInt();
                    if (money > account[id].getBalance()){
                        System.out.println("The amount is too large, ignored");
                    }
                    else account[id].withDraw(money);
                }break;
                case 3:{
                    System.out.print("Enter an amount to deposit: ");
                    double money = sc.nextDouble();
                    account[id].deposite(money);
                }break;
                case 4:{
                    System.out.println("交易记录:");
                    for(int j = 0; j < account[id].getTransation().size(); j++)
                    {
                        System.out.println(account[id].getTransation().get(j).toString());
                    }
                }
                default:break;
            }
        }
        sc.close();
    }
}